System and method of providing security to an external attachment device

ABSTRACT

Systems and methods of providing security to an external Serial Advanced Technology Attachment (SATA) device are described herein. A controller is connected between the eSATA device and the computing device. On startup, the controller presents a first partition of eSata device as a Read Only Memory, e.g., CD-ROM, but at the same time it restricts access of the computing device to a second partition of the eSata device until receiving a valid identity authentication. The second partition is preferably encrypted with a key stored on a first partition. Decryption is performed in the controller as part of presenting the eSata device. The authentication process is preferably stored in the first partition and downloaded to the computing device on startup.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 11/782,618, filed Jul. 24, 2007, which application furtherclaims priority to U.S. Provisional Patent Application Ser. No.60/939,030 entitled “Device, System and Method for Further EnhancedOperation of an eSata Device with a Host System,” which was filed on May18, 2007, the contents of which were expressly incorporated therein byreference. In addition, the present application is related to co-pendingU.S. patent application Ser. No. 11/782,613, entitled “Method andApparatus of Providing Power to an External Attachment Device via aComputing Device,” which was filed on Jul. 24, 2007, with the sameassignee as the present disclosure. The disclosure of theabove-identified application was incorporated in its entirety in parentapplication Ser. No. 11/782,618. In addition, this application is acontinuation-in-part of co-pending U.S. patent application Ser. No.11/669,092, filed Jan. 30, 2007; and Ser. No. 11/689,467, filed Mar. 21,2007; the entire contents of both are expressly incorporated herein byreference.

TECHNICAL FIELD

The present disclosure relates generally to a system and method ofproviding security to an external Serial Advanced Technology Attachmentdevice, and in particular to providing security to an external SerialAdvanced Technology Attachment (eSATA) storage device.

BACKGROUND

External storage devices may often be used to backup data on anotherstorage device, for example, from data stored on an internal storagedevice of a desktop computer and/or a laptop computer. External storagedevices are connected to a computing device via various types of ports,such as a USB port, an eSATA port, a FireWire port, etc. Further,external storage devices may frequently be hot-swappable, i.e. theexternal storage devices can be removed and connected to the computingdevice while it is powered on.

Thus, in addition to backing up data, external storage devices can alsobe used to transport data from one computing device to another, furtherfacilitated by scaling of external devices and the need for portabledigital data.

However, the ease with which portable devices such as notebooks,portable storage devices, etc. are lost has become a threat to datasecurity and personal privacy. Loss of portable storage devices may havedetrimental consequences due to, for example, loss of privacy ofpersonal and/or medical information, financial loss, and identity theft.

SUMMARY OF THE DESCRIPTION

Systems and methods of providing security to an external Serial AdvancedTechnology Attachment (eSATA) device are described herein. Someembodiments of the present disclosure are summarized in this section.

One embodiment includes a method, which may be embodied on a system, ofcreating a first partition of an external Serial Advanced TechnologyAttachment storage device, presenting to a computing device, the firstpartition of the external Serial Advanced Technology Attachment storagedevice, as a Read Only Memory; restricting the computing device fromaccessing a secured second partition of the external Serial AdvancedTechnology Attachment storage device; and in response to receiving avalid identity authentication, unrestricting access to the secondpartition of the external Serial Advanced Technology Attachment storagedevice.

In one embodiment, in response to receiving a logon request from thecomputing device, an identity authentication process is initiated,wherein the process is stored on the first partition. Furthermore, inone embodiment, a process stored on a disk controller receives anencryption key from the process stored on the first partition of theSerial Advanced Technology Attachment storage device, and the processstored on the disk controller uses the encryption key to decrypt thesecond partition of the Serial Advanced Technology Attachment storagedevice.

The present disclosure includes methods and apparatuses which performthese methods, including processing systems which perform these methods,and computer readable media which when executed on processing systemscause the systems to perform these methods.

Other features of the present invention will be apparent from theaccompanying drawings and from the detailed description which follows.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure is illustrated by way of example and not limitation inthe figures of the accompanying drawings in which like referencesindicate similar elements.

FIG. 1A illustrates an external attachment that communicates with acomputing device through a controller, according to one embodiment.

FIG. 1B illustrates a SATA storage device that communicates with acomputing device through an interface chip, via an eSATA port and a USBport of the computing device, according to one embodiment.

FIG. 2A illustrates an example screenshot of an interface for identifyverification via password submission, according to one embodiment.

FIG. 2B illustrates another example screenshot of an interface foridentity verification via password submission, according to oneembodiment.

FIG. 3A illustrates an example of an interface chip to communicate witha computing device via a plurality of ports of the computing device,according to one embodiment.

FIG. 3B illustrates an example of a plurality of SATA storage devicescoupled to an interface chip to communicate with the computing device ofFIG. 3A, according to one embodiment.

FIG. 4 is a flow chart illustrating a process to provide secured accessto one or more SATA storage devices, according to one embodiment.

FIG. 5 illustrates a block diagram of a machine-readable medium,according to one embodiment.

FIG. 6 is a block diagram of an embodiment of the invention.

FIG. 7 is a flow diagram a presentation feature of present invention.

DETAILED DESCRIPTION

The following description and drawings are illustrative and are not tobe construed as limiting. Numerous specific details are described toprovide a thorough understanding of the disclosure. However, in certaininstances, well-known or conventional details are not described in orderto avoid obscuring the description.

Reference in this specification to “one embodiment” or “an embodiment”means that a particular feature, structure, or characteristic describedin connection with the embodiment is included in at least one embodimentof the disclosure. The appearances of the phrase “in one embodiment” invarious places in the specification are not necessarily all referring tothe same embodiment, nor are separate or alternative embodimentsmutually exclusive of other embodiments. Moreover, various features aredescribed which may be exhibited by some embodiments and not by others.Similarly, various requirements are described which may be requirementsfor some embodiments but not other embodiments.

Embodiments of the present disclosure include systems and methods ofproviding security to an external storage device.

An external device can communicate with a computing device via one ormore interface ports of a computing device. The interface ports can beone of many interfaces, such as, a USB interface, a FireWire (IEEE 1394)interface, and/or an eSATA interface, etc. External storage devices mayadditionally be connected to a disk controller to be coupled to one ormore interface ports of the computing device. The type of diskcontroller depends on the interface of the external storage device. Thedisk controller can be a device separate from the motherboard or builtinto the motherboard.

For example, a SATA storage device can be connected to a controller tobe coupled to an eSATA port of the computing device. In one embodiment,the controller includes a software instance to present a SATA storagedevice coupled to the controller as multiple devices to the computingdevice. Thus, the computing device may see the SATA storage device asmultiple storage devices, i.e., as separate drives.

In one embodiment, the controller presents one of the partitions of theSATA storage device 40 the computing device as a bootable CD-ROM (e.g.,a disk image or .ISO file) to the operating system of the computingdevice. The controller initially blocks access to, and a secondpartition of the SATA storage device is initially locked (e.g., securedor encrypted). The second partition of the SATA storage device may notbe identified by the computing device while the second partition of theSATA storage device is locked.

When a request to logon to the computing device or to access the SATAstorage device is received, the CD-ROM partition of the SATA storagedevice includes an executable that can be automatically initiated. Inone embodiment, the executable includes a security application foridentification purposes. For example, the security application caninitiate a logon procedure to a user such that a user's identity isverified, via submission of various identifiers including, RFID,passwords, and/or other biometrics identifiers such as finger prints,etc.

Once the identification procedure has been completed, the securityapplication on the CD-ROM partition of the SATA storage deviceacknowledges the completion to the controller. Thus, in one embodiment,the software instance on the controller unlocks (e.g., decrypts) thesecond partition of the SATA storage device, and presents it as aseparate drive. The second partition then becomes visible and accessibleto the operating system and the computing device. In some instances, thesecurity application sends a security key (e.g., encryption key) to thesoftware instance for unlocking (e.g., decrypting) the second partitionof the SATA storage device.

FIG. 1A illustrates a SATA storage device 118 that communicates with acomputing device 102 through a controller 112, according to oneembodiment. In one embodiment, the controller 112 interfaces with thecomputing device via an eSATA connection to utilize an interconnectionof relatively longer length. The controller 112 can interface with theexternal SATA storage device using an eSATA connection or SATA basedconnections. Furthermore, the SATA storage device, as described andillustrated herein, includes either an external SATA storage device(e.g., eSATA) or other SATA devices that support the transfer of data at1.5 Gbps, 3 Gbps, or higher.

In one embodiment, the computing device 102 is a computing device ableto be coupled to a SATA storage device (e.g., the SATA storage device118). For example, the computing device 102 may include a chipset tosupport the SATA interface protocol. The computing device may also havean external port that can be connected to a SATA storage device.

Alternatively, the computing device can have a PCI based SATA controllermounted to the motherboard with an eSATA port accessible from a panelexternal to the chassis (e.g., a bracket connector). A SATA device cantherefore connect to the computing device through the eSATA controllercard via the externally accessible eSATA port.

The computing device 102 can be a laptop computer (e.g., notebook orportable computer) that utilizes a PCMCIA based controller having eSATAinterfacing capabilities. In some instances, the eSATA interfaceprotocol capability may be provided with a PCI-Express card. Thecomputing device 102 can be any of a PDA, a laptop, a desktop computer,a telephone, a cellular phone, a portable device, and/or a serverdevice, etc.

The controller 112 is a chip associated with circuitry to control astorage device. The controller can be built-in to a motherboard or beincluded in a stand-alone device that is separate from the motherboard.In general, the controller 112 can have one or more of many interfacessuch as, an IDE (PATA) interface, an EIDE interface, a SCSI interface, aSATA interface, and/or an eSATA interface. For example, the controller112 can be coupled to the SATA storage device 118. In one embodiment,the controller 112 has an IDE/EIDE interface to be coupled to an IDE toeSATA converter, such that the controller is able to communicate withthe SATA storage device.

FIG. 1B illustrates a SATA storage device 118 that communicates with acomputing device 102 through an interface chip 200, via an eSATA port104 and a USB port 106 of the computing device 102, according to oneembodiment.

The computing device 102 can include multiple interface ports such asthe USB port 106 and/or the eSATA port 104. The eSATA and/or USBconnectivity can either be built-in to the motherboard or added-onthrough an external PCI bracket (e.g., a host bus adaptor, or HBA) orcard-based controllers. The computing device may also have additionalports other than USB ports or eSATA ports, such as FireWire (IEEE 1394)ports that are not shown in the figure.

In one embodiment, the interface chip 200 is coupled to the eSATA port104, and the USB port 106 of the computing device. The USB port 106 ofthe computing device 102 can supply power to the interface chip 200and/or the SATA storage device 118 connected to the interface chip,whereas the eSATA port 104 of the computing device can be used for datatransmission to/from the SATA storage device 118.

In one embodiment, the interface chip 200 includes a software instance116 that is executable by a controller 112 of the interface chip 200.The software instance 106 can present the SATA storage device 118 asmultiple partitions 108-110A-N to an operating system of the computingdevice. The operating system can be any of Windows, Mac OSX, Linux,Unix, MacroS, etc.

In one embodiment, one of the partitions 108 of the SATA storage device118 is a virtual CD-ROM partition including a bootable .ISO file (e.g.,CD image). The additional partitions 110A-N may be secured, and remainso until completion of an authentication process.

In one embodiment, the secured partitions 110A-N (e.g., the partitionscan be encrypted) are not visible (not presented) to the operatingsystem of the computing device, and become operable for data access andstorage only when unlocked (e.g., decrypted).

The bootable .ISO file in the first partition 108 of the storage device118 can be launched in response to a request to logon to the computingdevice and/or a request to access the SATA storage device. In oneembodiment, the bootable .ISO file includes a security application toverify the identity of the user requesting system and/or storage deviceaccess. In one embodiment, the security application presents aninterface for password entry. In other embodiments, one or more types ofidentity verification such as RFID, fingerprinting or other biometricsidentifiers, passwords, voice recognition, etc., can be used.

Once the security application has verified the user's identity, acommand can be sent to the controller 112 indicating the user's identityhas been verified. In one embodiment, the command sent to the controller112 may include a security key (e.g., an encryption/decryption key) forunlocking the one or more secured partitions 110A-N of the SATA storagedevice. In one embodiment, the software instance 106 unlocks the one ormore secured partitions 110A-N of the SATA storage device and presentsthe unsecured partitions 110A-N to the operating system. The unsecuredpartitions 110A-N of the SATA storage device can then be accessed by theuser.

FIG. 2A illustrates an example screenshot of an interface for identityverification via password submission, as provided by the securityapplication, according to one embodiment.

The interface is launched by the security application stored in thefirst partition of the SATA storage device. In one embodiment, theinterface prompts the user to provide a password in the password field.The password can be entered via the on-screen keyboard as displayed. Inone embodiment, the password can be entered via a physical keyboard. Thepassword can be used to verify the user's identity prior to unlockingone or more secured partitions of the SATA storage device to be accessedby the user. In other embodiments, identifiers such as an RFID, voiceidentifiers, biometric identifiers such as fingerprints can be used toverify the user's identity.

FIG. 2B illustrates another example screenshot of an interface foridentity verification via password submission, according to oneembodiment.

In one embodiment, the interface includes an additional field forentering a second code in addition to the password. The second code maybe displayed on the interface in a non-machine readable format (e.g., ascrambled bitmap) to be read by the user and entered into the ‘bitmapwindow’ field.

FIG. 3A illustrates an example of an interface chip to communicate witha computing device via a plurality of ports of the computing device,according to one embodiment. The computing device 302 can includemultiple interface ports such as USB ports 306A-N and/or eSATA ports304A-N. The computing device may also have ports other than USB portsand/or eSATA ports, such as FireWire ports that are not shown in thefigure.

In one embodiment, the interface chip 300 includes the controller 312.The interface chip 300 may further include an eSATA interface 308, aconverter 310, and/or an USB interface 320. Even though the eSATAinterface 308 and the converter 310 as illustrated in 304, are shown tobe internal to the chip interface 300, in some embodiments, the eSATAinterface 308 and the converter 310, are external to the interface chip300. Alternatively, in some embodiments, the eSATA interface 308 isexternal to the interface chip 300 and the converter 310 is internal tothe interface chip 300. Similarly, the USB interface 320 can be externalor internal to the interface chip 300.

In one embodiment, the controller 312 is coupled to at least one eSATAport 304, and at least one USB port 306 via an eSATA interface 308 and aUSB interface 320, respectively. The USB interface 320 can supply powerto the controller 312 from one or more USB ports 306 of the computingdevice.

In some embodiments, multiple USB ports 306 can be utilized, dependingon the power requirements of the controller 312 and/or the SATA devices(e.g., storage devices) coupled to the controller. The number of USBports utilized to power the SATA devices can depend on one or more ofthe following metrics, such as the number of active SATA devices (e.g.,SATA storage devices), power supply/consumption of the computing device,and/or the data rate of the eSATA interface port (e.g., 1.5 Gbps, 3.0Gbps, or 6.0 Gbps).

FIG. 3B illustrates an example of a plurality of SATA storage devicescoupled to an interface chip to communicate with the computing device ofFIG. 3A, according to one embodiment. In one embodiment, the interfacechip 300 is connected to one or more SATA storage devices 318A-N. In oneembodiment, the USB interface 320 is to provide a pathway through whichthe computing device can supply power to the one or more SATA storagedevices coupled to the interface chip 300 via the one or more USB ports306A-N. The USB interface 320 can be internal or external to thecontroller 312.

The converters 310 and 314 illustrated in 322 in FIGS. 3A-3B may beprovided to translate signals transmitted between the controller and theSATA protocol (e.g., either between the controller and the eSATA port304 of the computing device or between the controller and the SATAdevice 318). The conversion is needed for the embodiment of thecontroller being compatible with an interface standard other than theSATA protocol. For example, the controller 312 can be a controller thatis compatible with the IDE (or PATA) protocol. Thus, the converters 310and 314 translate the data entering and leaving the IDE controller.

In one embodiment, the controller 312 is a SATA controller. Thus, theconverters 310 and 314 need not be present for coupling data between thecontroller and the eSATA port and the SATA devices, respectively.Similarly, the eSATA interface 308 can be internal or external to thecontroller.

FIG. 4 is a flow chart describing a process to provide secured access toone or more SATA storage devices, according to one embodiment.

In process 402, a partition of a SATA storage device is presented to thecomputing device as a bootable CD-ROM. In one embodiment, the bootableCD-ROM partition includes a .ISO file (e.g., disk image) having asecurity application to verify a user's identity.

In process 404, the computing device is restricted from accessing asecond secured partition of the SATA storage device. When unrestricted,the second partition can be a data drive to be used and accessed by theoperating system and/or the user. In some embodiments, multiple securedpartitions can be provided within the SATA storage device.

In one embodiment, data stored in the second partition of the SATAstorage device is encrypted via an encryption algorithm by a softwareinstance stored on the controller (e.g., disk controller). Variousencryption algorithms (e.g., 3DES, Blowfish, DES-X, and/or AES, etc.)may be used. In one embodiment, the encryption key is stored on thefirst partition of the SATA storage device. In other embodiments, theencryption key is stored on the software instance of the controller.

In process 406, an identity authentication process is launched inresponse to receiving a request to logon to the computing device, orwhen the computing device attempts to access data from the SATA storagedevice. The identity authentication process can be initiated by thesecurity application, stored in the first partition of the SATA storagedevice. In process 408, the identity authentication process prompts theuser to submit one or more valid identifiers for identity verification,such as an RFID, a password, and/or a biometric identifier such as afingerprint.

In response to receiving the valid identity authentication, in process410, the secured second partition of the SATA storage device isunsecured (e.g., decrypted) and the computing device is given access tothe data stored in the second partition. In one embodiment, the secondpartition is unsecured by the software instance on the controller. Thesecurity application stored on the first partition of the SATA driveperforms the identity verification, and in one embodiment, sends acommand to the software instance indicating that the user's identity hasbeen verified. The command may additionally include the encryption keyfor unlocking one or more secured partitions of the SATA storage device.

FIG. 5 shows a diagrammatic representation of a machine in the exemplaryform of a computer system 500 within which a set of instructions, forcausing the machine to perform any one or more of the methodologiesdiscussed herein, may be executed. In alternative embodiments, themachine operates as a standalone device or may be connected (e.g.,networked) to other machines. In a networked deployment, the machine mayoperate in the capacity of a server or a client machine in aclient-server network environment, or as a peer machine in apeer-to-peer (or distributed) network environment. The machine may be aserver computer, a client computer, a personal computer (PC), a tabletPC, a set-top box (STB), a personal digital assistant (PDA), a cellulartelephone, a web appliance, a network router, switch or bridge, or anymachine capable of executing a set of instructions (sequential orotherwise) that specify actions to be taken by that machine.

FIG. 6 shows an overview of an exemplary system 8-300. The elements atthe top half of the figure, as indicated by the label HW, are asimplified rendering of the system hardware. Host 7-110 has a USBconnector and an eSATA connector. (The USB connector for power supplypurposes, as described above, or in some cases, it may be the onlyconnection.) Chip 7-101 connects to external SATA hard drive 7-111, andboth would typically reside in an external enclosure (not shown here).The elements at the bottom half of the figure, as indicated by the labelSW, are a simplified rendering of the software architecture of the samesystem with host 7-110. A driver 8-310 for the eSATA Atapi connectionresides in host 7-110. Software instance 8-301 runs inside controller7-101. It has the ability to present two devices: an .ISO file ofvirtual CD-ROM 8-304, which is physically stored on partition 8-303 ofthe drive 8-305, and which shares space on the physical drive with theother partition 8-302, a data drive that is initially locked. When thecode 8-306, stored in the .ISO file 8-304, is executed, code 8-306contains a security application that presents to a user attempting tolog in a log-in procedure that requires some means of identification,such as some physical identification, such as RFID, fingerprint or otherbiometric identifier, etc. or a password (or both), or other type ofidentification. Once the identification requirement is satisfied, theapplication in code 8-306 sends a command to controller 7-101, which isexecuting software 8-301. Software 8-301 then unlocks the remainder ofthe physical drive 7-111 as usable partition 8-302, which is presentedas a separate drive.

FIG. 7 shows an exemplary process 8-400 for implementation of the systemaccording to one embodiment of the present invention. In step 8-401 the.ISO file is presented as a bootable CD-ROM to the operating system,such as Windows, MacroS, various types of Unix or Linux operatingsystems, etc. It is possible to have different versions of this softwarefor different operating systems, such as Windows, MacroS, various Unixand Linux operating system, etc., so that for each operating system,appropriate security software may be loaded. In step 8-402, the securitysoftware auto-executes. Once the user has entered his identification,such as a password or other ID, in step 8-403 the system sends asecurity key to software instance 8-301, which in this example is of thetype of software known as firmware, for authentication. At step 8-404,the process branches. If the authentication fails (−), the process loopsback to step 8-402 and the security software executes again. If theauthentication is successful (+), in step 8-405 the system unlocks andpresents the SATA drive, which is the remaining partition 8-302 of thephysical drive 7-111. Then in step 8-406, normal operations commence.Note that the virtual CD drive and the actual data drive are assigneddifferent drive letters, and both drives may be shown as drives withremovable media, with the media being inserted when the system unlocksthe drive.

While the machine-readable medium is shown in an exemplary embodiment tobe a single medium, the term “machine-readable medium” should be takento include a single medium or multiple media (e.g., a centralized ordistributed database, and/or associated caches and servers) that storethe one or more sets of instructions. The term “machine-readable medium”shall also be taken to include any medium that is capable of storing,encoding or carrying a set of instructions for execution by the machineand that cause the machine to perform any one or more of themethodologies of the present invention. In general, the routinesexecuted to implement the embodiments of the disclosure, may beimplemented as part of an operating system or a specific application,component, program, object, module or sequence of instructions referredto as “computer programs.” The computer programs typically comprise oneor more instructions set at various times in various memory and storagedevices in a computer, and that, when read and executed by one or moreprocessors in a computer, cause the computer to perform operations toexecute elements involving the various aspects of the disclosure.

Moreover, while embodiments have been described in the context of fullyfunctioning computers and computer systems, those skilled in the artwill appreciate that the various embodiments are capable of beingdistributed as a program product in a variety of forms, and that thedisclosure applies equally regardless of the particular type of machineor computer-readable media used to actually effect the distribution.Examples of computer-readable media include, but are not limited to,recordable type media such as volatile and non-volatile memory devices,floppy and other removable disks, hard disk drives, optical disks (e.g.,Compact Disk Read-Only Memory (CD ROMS), Digital Versatile Disks,(DVDs), etc.), among others, and transmission type media such as digitaland analog communication links.

Although embodiments have been described with reference to specificexemplary embodiments, it will be evident that various modifications andchanges can be made to these embodiments without departing from thebroader spirit and scope as set forth in the following claims.Accordingly, the specification and drawings are to be regarded in anillustrative sense rather than in a restrictive sense.

1. In a system comprising a computing device having an eSata port and anUSB port, a controller connected to said eSata port and said USB port,and an external Serial Advanced Technology Attachment storage deviceconnected to said controller, a method comprising: on controllerstartup, the controller presenting to a computing device via the USBport data from a first partition of the external Serial AdvancedTechnology Attachment storage device, as a Read Only Memory whereby thecomputing device is caused to assign to the first partition a driveletter and provide to the first partition read access; downloading fromsaid controller into said computing device and causing the execution insaid computing device an authentication process; and in response toreceiving a valid authentication, presenting to the computing device asecond partition of the external Serial Advanced Technology Attachmentstorage device as an eSata storage device, wherein the second partitionremains invisible to the computing device until presented; and wherebyafter presentation the computing device is caused to assign to thesecond partition a drive letter and to provide to the first partitionread/write access.
 2. The method of claim 1, wherein the secondpartition of the external Serial Advanced Technology Attachment storagedevice is encrypted.
 3. The method of claim 2, further includingdecrypting the second partition as part of the presentation step.
 4. Themethod of claim 1, wherein the identity authentication process comprisesverifying at least one of a RFID, a password, or a biometric identifier.5. The method of claim 3, further comprising accessing an encryption keyfrom the first partition of the Serial Advanced Technology Attachmentstorage device.
 6. A system comprising: means, on controller startup,for the controller presenting to a computing device via the USB portdata from a first partition of the external Serial Advanced TechnologyAttachment storage device, as a Read Only Memory, whereby the computingdevice is caused to assign to the first partition a drive letter andprovide to the first partition read access; means for downloading fromsaid controller into said computing device and causing the execution insaid computing device of an authentication process; and means, inresponse to receiving a valid authentication, for presenting to thecomputing device a second partition of the external Serial AdvancedTechnology Attachment storage device as an eSata storage device, thesecond partition remaining invisible to the computing device untilpresented, and whereby after presentation the computing device is causedto assign to the second partition a drive letter and to provide to thefirst partition read/write access.
 7. In a system comprising a computingdevice having a USB port and an external storage unit having a USBcontroller, a method comprising: on controller startup, the controllerpresenting to the computing device via the USB port data from a firstpartition of the external storage device as a Read Only Memory, wherebythe computing device is caused to assign to the first partition a driveletter and provide to the first partition read access; causing theexecution of an authentication process; and in response to receiving avalid authentication, the controller presenting to the computing devicea second partition of the external storage device, wherein the secondpartition remaining invisible to the computing device until presented,and whereby after presentation the computing device is caused to assignto the second partition a drive letter and to provide to the firstpartition read/write access.
 8. The method of claim 7, wherein thesecond partition of the storage device is encrypted.